From patchwork Fri Jul 3 07:32:35 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ahmad Fatoum X-Patchwork-Id: 11641033 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 89BF113B6 for ; Fri, 3 Jul 2020 07:32:50 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 7BB6F208B8 for ; Fri, 3 Jul 2020 07:32:50 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1725786AbgGCHcu (ORCPT ); Fri, 3 Jul 2020 03:32:50 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:35548 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725648AbgGCHct (ORCPT ); Fri, 3 Jul 2020 03:32:49 -0400 Received: from metis.ext.pengutronix.de (metis.ext.pengutronix.de [IPv6:2001:67c:670:201:290:27ff:fe1d:cc33]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id BD3C8C08C5C1 for ; Fri, 3 Jul 2020 00:32:49 -0700 (PDT) Received: from dude.hi.pengutronix.de ([2001:67c:670:100:1d::7]) by metis.ext.pengutronix.de with esmtps (TLS1.3:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1jrGBc-0003No-07; Fri, 03 Jul 2020 09:32:40 +0200 Received: from afa by dude.hi.pengutronix.de with local (Exim 4.92) (envelope-from ) id 1jrGBa-0006F1-V9; Fri, 03 Jul 2020 09:32:38 +0200 From: Ahmad Fatoum To: Nicolas Ferre , Alexandre Belloni , Ludovic Desroches , Stephen Boyd Cc: kernel@pengutronix.de, Ahmad Fatoum , Michael Turquette , linux-clk@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org Subject: [PATCH] clk: at91: fix possible dead lock in new drivers Date: Fri, 3 Jul 2020 09:32:35 +0200 Message-Id: <20200703073236.23923-1-a.fatoum@pengutronix.de> X-Mailer: git-send-email 2.27.0 MIME-Version: 1.0 X-SA-Exim-Connect-IP: 2001:67c:670:100:1d::7 X-SA-Exim-Mail-From: afa@pengutronix.de X-SA-Exim-Scanned: No (on metis.ext.pengutronix.de); SAEximRunCond expanded to false X-PTX-Original-Recipient: linux-clk@vger.kernel.org Sender: linux-clk-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-clk@vger.kernel.org syscon_node_to_regmap() will make the created regmap get and enable the first clock it can parse from the device tree. This clock is not needed to access the registers and should not be enabled at that time. Use device_node_to_regmap to resolve this as it looks up the regmap in the same list but doesn't care about the clocks. This issue is detected by lockdep when booting the sama5d3 with a device tree containing the new clk bindings. This fix already happened in 6956eb33abb5 ("clk: at91: fix possible deadlock") for the drivers that had been migrated to the new clk binding back then. This does the same for the new drivers as well. Fixes: 01e2113de9a5 ("clk: at91: add sam9x60 pmc driver") Signed-off-by: Ahmad Fatoum Acked-by: Alexandre Belloni --- Only boot tested on the sama5d3. --- drivers/clk/at91/at91sam9g45.c | 2 +- drivers/clk/at91/at91sam9n12.c | 2 +- drivers/clk/at91/sam9x60.c | 2 +- drivers/clk/at91/sama5d3.c | 2 +- 4 files changed, 4 insertions(+), 4 deletions(-) diff --git a/drivers/clk/at91/at91sam9g45.c b/drivers/clk/at91/at91sam9g45.c index 9873b583c260..fe9d391adeba 100644 --- a/drivers/clk/at91/at91sam9g45.c +++ b/drivers/clk/at91/at91sam9g45.c @@ -111,7 +111,7 @@ static void __init at91sam9g45_pmc_setup(struct device_node *np) return; mainxtal_name = of_clk_get_parent_name(np, i); - regmap = syscon_node_to_regmap(np); + regmap = device_node_to_regmap(np); if (IS_ERR(regmap)) return; diff --git a/drivers/clk/at91/at91sam9n12.c b/drivers/clk/at91/at91sam9n12.c index 630dc5d87171..4aa97e672bd6 100644 --- a/drivers/clk/at91/at91sam9n12.c +++ b/drivers/clk/at91/at91sam9n12.c @@ -124,7 +124,7 @@ static void __init at91sam9n12_pmc_setup(struct device_node *np) return; mainxtal_name = of_clk_get_parent_name(np, i); - regmap = syscon_node_to_regmap(np); + regmap = device_node_to_regmap(np); if (IS_ERR(regmap)) return; diff --git a/drivers/clk/at91/sam9x60.c b/drivers/clk/at91/sam9x60.c index 3e20aa68259f..2b4c67485eee 100644 --- a/drivers/clk/at91/sam9x60.c +++ b/drivers/clk/at91/sam9x60.c @@ -178,7 +178,7 @@ static void __init sam9x60_pmc_setup(struct device_node *np) return; mainxtal_name = of_clk_get_parent_name(np, i); - regmap = syscon_node_to_regmap(np); + regmap = device_node_to_regmap(np); if (IS_ERR(regmap)) return; diff --git a/drivers/clk/at91/sama5d3.c b/drivers/clk/at91/sama5d3.c index 5e4e44dd4c37..5609b04e6565 100644 --- a/drivers/clk/at91/sama5d3.c +++ b/drivers/clk/at91/sama5d3.c @@ -121,7 +121,7 @@ static void __init sama5d3_pmc_setup(struct device_node *np) return; mainxtal_name = of_clk_get_parent_name(np, i); - regmap = syscon_node_to_regmap(np); + regmap = device_node_to_regmap(np); if (IS_ERR(regmap)) return;